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Working capital is the money that your business can access quickly. It's the money you need to pay suppliers, wages, buy stock and keep things moving. Think of it as your company's financial leeway.
It puts you in the position to secure supplier deals, invest in expansion opportunities, address unexpected issues and negotiate from a position of strength. Yet, even profitable businesses can experience cash flow problems if they don't have enough working capital.
Even a firm with healthy profit margins on paper may suddenly struggle to pay its employees because its money is tied up in unpaid bills and unsold stock. That's the problem with working capital: it's less about bookkeeping and more about survival.
The basic maths: net working capital
The working capital equation is simple. You add up everything your firm owns that can be converted into cash within 12 months, then subtract everything owed within that timeframe.
Working capital = short-term assets – short-term debts.
For example, if a company's ledger shows £300,000 in short-term assets and £200,000 in short-term debts, its working capital would equal £100,000.
Short-term (or current) assets
Short-term assets (also called ‘current assets’) are assets you expect to turn into cash or use up within one year. These include cash and cash equivalents, money owed to you by buyers (receivables), stock (such as raw materials and finished products), advance payments, and other short term assets.
The speed at which these assets can be converted to cash is important. Cash is instant; receivables are converted when buyers pay, but inventory must be sold before cash comes in. A business holding £120,000 in short-term assets is not in the same position if £90,000 of that is slow-moving stock rather than ready-to-collect receivables.
Short-term (or current) liabilities
Short-term debts (also called ‘current liabilities’) are financial obligations that will be due within 12 months. These typically include bills to pay, short-term loans, accumulated costs (wages, taxes, interest), current portions of long-term debt, and customer deposits.
Managing the timing of these obligations is just as important as managing your assets.
Extending payment terms with suppliers while accelerating collections from customers, for example, is a core working capital optimisation strategy.
A practical example
Here's a realistic scenario for a mid-sized UK manufacturing company.
Current Assets
| Item | Amount (£) |
| Cash | 55,000 |
| Accounts receivable | 120,000 |
| Inventory | 62,000 |
| Prepaid expenses | 10,000 |
| Total Current Assets | 247,000 |
Current Liabilities
| Item | Amount (£) |
| Accounts payable | 70,000 |
| Short-term loans | 30,000 |
| Accrued wages and taxes | 24,000 |
| Total Current Liabilities | 124,000 |
Working Capital Calculation
| Description | Amount (£) |
| Total Current Assets | 247,000 |
| Total Current Liabilities | 124,000 |
| Working Capital | 123,000 |
Working Capital = £247,000 – £124,000 = £123,000
This company has £123,000 in working capital, meaning it has a comfortable cushion to meet short-term obligations. But here's the catch: the number alone doesn't tell the whole story.
Though the same concept of working capital exists worldwide, its calculation in official financial statements is governed by accounting standards. In the UK, companies usually apply either UK GAAP (specifically FRS 102) or international reporting standards (IFRS). While both systems use the same definitions for assets and liabilities, minor differences in classification and presentation can affect the final working capital figure.
How to calculate the working capital ratio (current ratio)
The working capital ratio, also called the current ratio, puts the working capital in proportion rather than using an absolute number.
Current Ratio = Current Assets / Current Liabilities
Using our example: £247,000 / £124,000 = 1.99
A current ratio between 1.2 and 2.0 is generally considered healthy for most businesses, though ideal ranges vary by industry. A ratio of 1.0 means your current assets exactly equal your current liabilities, meaning you can technically pay your bills, but there's no safety margin.
What about ratios above 2.0? It might seem counterintuitive, but an excessively high ratio can indicate inefficiency. You might be holding too much idle cash that could be invested in growth, or you’re keeping slow-moving inventory tying up resources.
Industry context is everything here. Retail businesses often operate comfortably with lower ratios because they convert inventory to cash rapidly. Manufacturing and construction typically need higher ratios because they must fund materials and labour far in advance of getting paid.
| Current Ratio | Interpretation |
| Below 1.0 | Potential liquidity issues; company may struggle to meet obligations |
| 1.0 – 1.2 | Very tight; limited buffer for unexpected expenses |
| 1.2 – 2.0 | Healthy range for most businesses |
| Above 2.0 | May indicate inefficient use of capital |
| Above 3.0 | Unusual; redeploying capital for growth makes sense |
Positive vs. negative working capital
Positive working capital means that a company's short-term assets exceed its short-term debts (with a ratio greater than 1.0). This is the position that companies aim for. It demonstrates that you have sufficient short-term resources to pay bills, fund operations and create a buffer against unexpected events.
It gives you the financial flexibility to negotiate better terms with suppliers, take advantage of bulk-buying discounts, expand without immediately seeking external funding, and weather unforeseen challenges such as market downturns.
Negative working capital occurs when short-term liabilities exceed short-term assets (a ratio below 1.0). This indicates financial strain, particularly for businesses requiring substantial inventories or facing lengthy collection periods. It may indicate difficulty in meeting short-term obligations, the need for emergency funding, strained relationships with suppliers, or limited capacity to fund expansion.
But negative working capital isn't always a problem. It also depends on where in current assets capital sits; is it really liquid like cash or not immediately accessible like receivables? Large retailers can operate with negative working capital because they collect cash from customers immediately while paying suppliers on extended terms. They may choose to have a long payment cycle while quickly turning over inventory. As the saying goes, "cash is king". Understanding how quickly your cash converts matters more than the static working capital or current ratio alone.
Optimising the cash conversion cycle
The cash conversion cycle (CCC) measures how long it takes for your money to be tied up in operations before it returns. The shorter your cycle, the more effectively you are managing working funds.
(Cash Conversion Cycle) CCC = Days Inventory Outstanding (DIO) + Days Sales Outstanding (DSO) – Days Payable Outstanding (DPO)
DSO, DIO, and DPO: what it means and what you can actually do about them
Days Sales Outstanding (DSO) measures how long it takes to collect payment after closing a deal. You can reduce your DSO by setting transparent credit rules, offering early-payment incentives, automating bill creation, promptly following up on late payments, and simplifying customer payment processes.
Days Inventory Outstanding (DIO) measures how long goods remain unsold. You can try to reduce your DIO by using accurate demand forecasting, efficient stock management, regular checks on slow-moving items, strong supplier relationships, and streamlined storage processes.
Days Payable Outstanding (DPO) measures how long it takes to pay suppliers. You may try to optimise your DPO by negotiating extended payment terms where feasible and securing prompt-payment rebates when advantageous, while maintaining supplier trust.
Companies with shorter cash conversion cycles tend to enjoy competitive advantages beyond improved cash flow. Your cycle determines exactly how much working capital you'll need to fund operations.
Using technology to optimise working capital
Thanks to technology, the way treasury work is done has changed dramatically. Manual spreadsheets, disconnected tools and slow reports that tied finance professionals up are being replaced by integrated, automated platforms.
This matters for working capital management: Treasury platforms such as Embat provide finance teams with the tools they need to manage working capital effectively. These solutions integrate directly with banks and accounting software, providing real-time information without the need for manual data entry, automating cash tracking and forecasting with AI-powered predictions, enabling faster book closings, and offering flexible displays to help identify issues before they escalate.
